* First take on subsetting svg icons
* FontAwesome 5 svg subset WIP
* Include icons from plugins/badges into svg sprite subset
* add svg icon support to themes
* Add spec for SvgSprite
* Misc. SVG icon fixes
* Use FA5 svgs in local-dates plugin
* CSS adjustments, fix SVG icons in group flair
* Use SVG icons in poll plugin
* Add SVG icons to /wizard
* fill blank space when no theme is selected
* animate row's height in themes/components list when selecting, and hide children list
* show warning when you move to a different page and have unsaved changes
* refactor `adminCustomizeThemes.show` controller
* allow collapsing/expanding children lists
* fix a bug when adding components to a theme (changed the way it works slightly)
* a bunch of other minor things
